int analogPin= 0;
int count =0;
int raw= 0;
int Vin= 5;
int before=0;
float Vout= 0;
float R1= 1000;
float R2= 0;
float buffer= 0;

void setup()
{
Serial.begin(9600);
}

void loop()
{
raw= analogRead(analogPin);
if(raw)
{
buffer= raw * Vin;
Vout= (buffer)/1024.0;
buffer= (Vin/Vout) -1;
R2= R1 * buffer;
if (R2< 200000) {
  count++;
  Serial.println("---------");
  Serial.print("count number: ");
  Serial.println(count);
  Serial.print("R2: ");
  Serial.print(R2);
  Serial.println();
}
}
}